Shiva Purana
प्राजापत्यं भवेद्यर्हिं तर्ह्येको हि भवान्भवेत् ॥ तदा पूजा च सम्पूर्णान्यथा सर्वा च निष्फला ॥ ४९ ॥
When the Prājāpatya rite is performed only one of you shall be there. Then alone is the worship complete. Or everything becomes fruitless.
english translation
prAjApatyaM bhavedyarhiM tarhyeko hi bhavAnbhavet ॥ tadA pUjA ca sampUrNAnyathA sarvA ca niSphalA ॥ 49 ॥
hk transliteration by Sanscript